Thomas geay



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' r. GRAY.

Spring Tooth Harrow. No. 239,043. Patented March 22,1881.

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N.PETERs, PHOTOLlTHOGkAPHER, WASHINGTON, D C

UNITED STATES PATENT OFFICE.

THOMAS GRAY, OF OSHAWA, ONTARIO, CANADA.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 239,043, dated March 22, 1881.

Application filed November 11, 1880. (ModeL) and arraiigement of parts, as more fully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is a plan of an iron-frame harrow, in the construction of which my improvements are embodied. Figs. 2, 3, 4, 5, and 6 are details of construction.

Thedrawin gs shown represent an iron-frame harrow, but my improvements are applicable to, and are equally advantageousupon, Wooden-frame barrows.

A is the frame, constructed substantially in the usual way, two or more sections being coupled together to form a harrow of the desired width and number of teeth.

B are the bars to which the spring-teeth G' are fastened. These bars are attached to and supported by lugs D and D, placed respectively upon the frame and bars. The lugs I) are pivoted to the frame by the bolts 01, and each lug is provided with a curved slot, D which is struck from the bolt (1 as a center.

(1 is a bolt, which passes through the slot D into a projecting arm, (1 of the lug D, and forms the means whereby the lugs can be clamped together, and thus hold the bars B and attachments in any position in which they may be placed. By means of this attachment the angle of the teeth to the ground can be varied to suit the different requirements of varying land, or for deep or light work,,with rapidity and ease, and renders the springtooth harrow capable of properly performing work which hitherto it has been but imperfectly adapted to do.

In Figs. 2 and 3 the manner of fastening the teeth to the tilting bars is shown.

E is a socket, which is recessed to receive the bent end of the tooth, and slips easily upon. the bars, there being sufficient room between the bar and the sides of the bar-opening for the introduction of a pair of wedges, F and G. These Wedges are introduced on the top and rear sides of the bars B, and when driven tight securely fasten the teeth and sockets to the tilting bars without the use of bolts, pins,

or drilling. When a wooden frame is used the ened to the front of the bars B, and that they curve upward from the point of connection. Owing to this form of connection and shape of tooth the teeth will not clog like other springtooth barrows. I do not care how many teeth 0 are used in each frame, as this is a matter which can well be left to the experience of the manufacturer; but in order to avoid leaving a ridge between the frames nnharrowed, I extend the rods carrying the teeth beyond the frame and place teeth upon them.

The advantages of my invention are cheapness and strength of construction, combined with adaptability for the work to be done.

I claim as new and desire to secure by Letters Patent 1. In a spring-tooth barrow, the combination, with the frame having fixed lugs D, provided with bolt-arms d of tooth-supporting bars provided with tilting and fastening lugs D, having curved slots D pivot-bolt d, and fastening-bolt d, substantially as and for the purpose set forth.

2. The combination, with a spring-tooth, 0, having its end bent at an angle to fit two sides of the tooth-bar B and socket E, of the recessed socket E, tooth-bar B, and fastening-Wedges, substantially as and for the purpose set forth.

THOMAS GRAY.

Witnesses: G. N. VARS, J. W. J oHNsToN. 

